Explosive-engine



G. AMONSEN.

EXPLOSIVE ENGINE.

APPLICATION m50 FEB. 5. 19164 Patented 'Ovt 14 LSS'H.

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' ann erratas earner orare GILBERT AMONSEN, OF MINNEAPOLIS, MINNESOTA.

EXPLOSIVE-ENGINE.

Specification of.' Letters Patent.

Patented Oct. 14, 1919.

To all lwhom, t may concern:

Be, it known that I, GILBERT AMONSEN, a citizen of the United States,residing at Minneapolis, in the county f Hennepin and State ot'l.\/[innesota, have invented certain new and useful Improvements inExplosivellngines, of which the following is a speciication.

My invention relates to two-cycle horizontal explosive engines and hasfor its object to provide along piston which is partly cut away at itscenter to allow a crank to operate between the ends of said piston andwithin the same. A further object is to ottset both wrist pin and theCrank shaft on opposite sides of the center line of the piston, so thaton the compression stroke ot the piston thel same will be forced downagainst the intake port and prevent leakage of the explosive mixture.Another object is to provide a. gas passageway which may have its volumechanged by means ot' a plug screwable in andiout ot' the saine, thusvarying the degree of compression. A still furtherl Fig. '2 is anenlarged'longitudinal sectionall view taken en line 2-2 of Fig. l. 'Fig3. is a fragmentarycross sectional viewl taken` on line 3-3 ot Fig.` 1.

Vln constructing my improved torni of e-xplosive engine l prefer to castthe cylinders in pairs and bolt a number oli' pairs together, as shownin Fig. l. though the same may be made singly or all combined in onecasting.

.\ indicated in lt`igs. 1 and f5. a casting l()y providesl two cylindersllandl2 whiclrare separated by a' wall lrand surroululcd by a a'tei'-j'acketl-t.. rlhe top portions et said cylinders andthewater-jacket are cut away across all of the cylinders.

to provide a hand hole 15, which may be closed by a cover plate 16extending clear A casting 17, similar to casting 10, is placed adjacentto it, and is belted tast thereto by means of bolts 18 passing throughwalls 19 and 20 integral with said castings and extending up flush withthe top ot' hand hole 15, which bolts' may be. inserted and appliedthrough said hand hole. Cylinders 11, 12, etc., are of uniform bore andare open at both ends. Each pair of cylinders is closed at one end witha cylinder head 21 which has Aa compleiientary water-jacket and eachhead covers the two corresponding cylinders and is secured thereto bymeans of studs '2-3. The other ends of the pairs of cylinders arecovered by plates 2i which serve the same purpose as the heads 21 butare deprived of w at er-j a ck'ets.

l'l'ithin the various cylinders are positioned pistons Q5, 2G, etc.,which are identical in construction and which operate in the samemanner. Fig. 2 shows the details of construction and operation of pistonQ and cylinder 1'2. Piston Q5 is provided with rings 4.4 at bot-h endsand has a portion of the top along the center thereof cut away to makeroom for a crank shaft 27 which passes directly through all of thecylinders. This crank shaft is positioned somewhat above the centerlines ot the cylinders and nearer to one end of said cylinders than tothe other. One of the cranks 2S is secured to a connectingrod 29 whichis pivoted to one end 30 of piston Q''by means of a wrist pin -31 in theusual manner, and said crank just clears thickened portions 4G and 47 ofthe piston, as seen in Fig. .3 .1 The wrist pin 31 is below thecenterline of the piston, as can be clearly seen in Fig. 2. `Due to thisarrangement the connecting rod '29 clears the bottom ot' the pistonandthe aperture in the top of the piston may be made fairly short, thusreducing the total length of the piston.

A gas passageway 3Q, is located directly under the cylinder l2, passesalong the saine andcomnuniicates with the interior thereof at one end bymeans of a port 34 and at the other end 35 by means ot a port 36. An

tion 39 of the piston head, which is per-` forated at 40 to act as abaille for directing the incoming mixture away from the exhaust port 41.This baille also serves to heat the incoming gases which are exposed tothe bottom of the same as well asto the sides of the perforations 40. Inrunning, the crank shaft rotates in the direction indicated by the arrowin Fig. 2. The operation is as follows. When the piston travels towardthe explosion endof the cylinder the carbureted gas" is drawn into thechamber 33 through a check valve 37 mounted on the plate 24 from acarbureter not shown in the drawings. Upon the reverse stroke of thepiston the check valve 37 closes and the mixture within chamber 33 iscompressed into the passageway 32 and as soon as the piston 25 passesthe port 41 the burned gases Within chamber 35 are allowed to dischargethrough the same. In this position piston 25 covers both ports 34 and 36and so prevents any possible occurrence of backlire. When the pistonthen uncovers port 36 the fresh mixture rushes into chamber 35 in theusual manner, expelling nearly all the foul gases. Further movement ofthe piston compresses the gas in the explosion chamber which is ignitedin the usual manner by a spark plug 45. It will here be noted that asthe crank 28 travels through the compression stroke, the piston 25 isforced downward against the port 36 through the vertical component offorce procured by offsetting the crank shaft and wrist pin from thecenter line of the piston, thus preventing leakage and insuring asulicient degree of compression.

Passageway 32 communicates, as shown in Fig. 2, with adownwardly-extended bore 42 which is internally threaded to receive aplug 43. By screwing said plug into or out of the bore 42 the volume ofthe combined passageway can be varied to secure any degree ofcompression desired.

The manner of journaling the crank shaft is bestseen in Figs. 1 and 3. Apair of bosses 48 and 49 are cast integral with the outer sides of thecylinder castings 11 and 17, and carry bearing bushings 50 which supportthe crank shaft at the two ends. A central bearing bushing 51 supportsthe crank shaft at the center and is carried by two complemental bearingmembers 52 and 53. Members 52 and 53 are held in place between the walls19 and 2O4 of castings 11 and 17 by means of plates 54 and 55 castintegral therewith, through which the bolts 18 pass. By this means thisbearing can be easily alincd and is furthermore rigidly supported. 4

For the purpose of assembling, a slot 68 is formed in each of the sidewalls 19 and 20 of the castings 10 and 17, through which the crank shaftmay be inserted. vThe crank shaft 27 has attached to it at one end a flywheel 56, as is customary with most engines. Feet 57 may be cast withlthe cylinders for supporting the engine and for securing the same tosome suitable base.

The advantages of my invention are manifest. With the cover plate andhand hole positioned on the engine as shown all parts of the enginebecome accessible from the top and the remov/al or substitution of partsbecomes very simple. The piston proper may be used as an oil reservoirand thus all of the working parts may be kept well oiled without the useof an auxiliary oiling system. The compression in the intake end of thecylinder serves as a cushion-,for the piston and helps to return it to'lopposite end.

I claim:

l. A two cycle explosive engine compris? ing a horizontal cylinderhaving a port in the bottom thereof, a piston within the cylinderadapted to cover said port throughvout the greater portion of itscompression stroke and to remain seated over said port provide chambersat the ends of the piston,

the one being a pumping chamber andv the other an explosion chamber, acrank shaft having operative connection with said piston between theends thereof, a charging chamber having port connections with thepumping chamber and with the explosion chamber, the opening of saidports being controlled by the piston, a valve for admitting explosivemixture into the pumping chamber, and means for varying the capacity ofthe charging chamber.

3. A two-cycle explosive engine comprising a horizontal cylinder, adouble-ended piston in said cylinder of such length as to providechambers at theends of the piston, the one being a pumping chamber andthe other an explosion chamber, a crank shaft having operativeconnection with said pislOl ton between the ends thereof, a chrgngchamber having port connections with the pumping chamber and with theexplosion l chamber, the opening of said ports being controlled by theiston, a valve for admitting explosive mixture into the pumping chamber,said charging chamber including a threaded cavity fitted with a. screwplug for varying at will the capacity of the charging chamber.

In testimony whereof I affix my signature in presence of two Witnesses.

. GILBERT AMONSEN. Witnesses:

CHARLOTTE E. DAY, ALEX LAGAARD.

